Albeet f



(No Model.)

- A. P. GRISWOLD.

meme FOR SAW MILL HEAD BLOCKS. No. 281,762. Patented Ju1y24, 1883.

g [p JrWW UNITED STATES PATENT OFFICE...

ALBERT F. eRrswoLD,-oE ERIE, PENNSYLVANIA.

FACING FOR SAW-MILL HEAD-BLOCKS.

SPECIFICATION forming part of Letters Patent No. 281,762, dated July 24,1883.

- Application filedJannary 6, 1883. (No model.)

nia, have invented certain new and useful Improvements in Facings forSaw Mill Head Blocks; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to the construction of sawmill head-blocks; andit consists in providing a steel facing for the nose and face of theblock, as hereinafter specified.

In the operation of sawing, the log, when it is set forward for a newcut by the action of the knees, is slid on the face of the block, andthe result is that it wears away the face very rapidly, and so it hasbeen found necessary to face the face of the block with steel. Suchfacings have been laid from the point of the nose back along the face ofthe block. Two difficulties have been found to exist in thisc0nstructionviz., the end of the facing at the point of the nose is veryapt to get caught by an oncoming log, and get bent up, and especially sowhen the facing becomes worn thin at that point. The other defect isthat when the facing becomes worn thin at the nose end of the block, asit does to a far greater extent than at points farther, back, entire newfacingplates are required, although themear parts of the plates may bevery little worn, there being no provision made for reversing theplates. To remedy these defects is the object of the construction hereshown.

The invention is illustrated in the accompaing drawings as follows:Figure 1 is a side elevation of a head-block and knee, and shows myimproved facing in place. Fig. 2is afront elevation of the nose of theblock, and shows my facing in place. Fig. 3, is a perspective view ofthe facings detached from the block.

A is the block; a, the faceof the block. B is the plain facing-plate; B,the nose facing. piece, and C the knee. The construction will be readilyunderstood from the illustration. The facings are in two parts, theplate B and the nose-piece B. They are held in place 011 tioned.

the block by bolts D D, &c., which have their heads countersunk in theholes cl d in the facings. The plates B have the holes (Z so arrangedthat they can be placed in the same position on the blocks either endforemost, and hence can be reversed when desired. The nose-pieces B aremade with a lip or back- .lap, 12, which reaches down under the nose ofthe block, and is there secured by a screw. The top or face .part of thepiece B is secured by a bolt, D, and may also have screws, as shown,nearer the point. The most wear upon the facings is at the point of thenose, and gradually diminishes toward the rear of the block. Hence it isthat the nose-pieces wear out first, and when constructed as shown, theycan be replaced with new ones, when de sired, and when so replaced theplates B are reversed end for end, and the unworn end of the plate Bwill correspond in thickness with the end of the new nose-piece. Asidefrom the purposes of this construction above named the facing of thenose of the block is very important, in that it prevents the nosebecoming mutilated by coming in contact with the logturning apparatus,which is constantly occurring, and often results in breaking andchipping off the end of the nose so much that the block is unable tosustain the last boardin the cant. So far as this latter purpose isconcerned the fac ing-piece and nose-piece may all be one piece ofmetal.

What I claim as new is 1. A facing-plate forsaw-mill head-blocks,

having thereon a lip or back lap, I), which reaches over and below thenose of the block, substantially as and for the purposes men '2. Afacing for saw-mill head-blocks, con sisting of the two parts B and B,of which the part B is constructed to be reversed, as described, and thepart B is made to reach over and below the nose of the block, as shownand for the purposes mentioned.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERT F. GRISXVOLD.

Witnesses: i

JNo. K. HALLOCK, ROBERT H. PORTER.

